feat: Brainstorm Topics with GSC + Issue #518 fixes + Blog Editor enhancements

Issue #518 - Subscription not updating after checkout:
- Fix stale closure in SubscriptionContext checkout polling (use subscriptionRef)
- Move checkout success polling from InitialRouteHandler into SubscriptionContext
- Remove redundant polling code from InitialRouteHandler
- Fix plan label: 'Free' instead of 'No Plan', proper capitalization
- Add plan refresh button in UserBadge
- Add 'View Costing Details' to UserBadge dropdown
- Rename 'ALwrity Podcast Maker' to 'Podcast Creator' across UI
- Clean subscription=success URL param after verification

Blog Writer WYSIWYG Editor enhancements:
- Per-section preview toggle (view/edit icons)
- Enhanced hover-based toolbar
- Circular SVG progress stats bar with detailed tooltip
- Research tool chips in stats bar footer
- Per-section TTS with useTextToSpeech hook (browser native)
- Full blog preview modal with print/PDF support
- PlayAllTTSButton: sequential playback with progress bar
- OnThisPageNav: floating sidebar with scroll tracking
- Section data attributes for scroll anchoring

GSC Brainstorm Topics feature:
- Backend: gsc_brainstorm_service.py (rule-based + LLM recommendations)
- Backend: POST /gsc/brainstorm endpoint with 3-word minimum validation
- Frontend: gscBrainstorm.ts API client
- Frontend: useGSCBrainstormConnection hook (popup OAuth, no /onboarding redirect)
- Frontend: useGSCBrainstorm hook (connect check + brainstorm call)
- Frontend: GSCBrainstormModal (3-tab results: Opportunities, Gaps, AI Recs)
- Frontend: BrainstormButton (visible at 3+ words, GSC connect overlay)
- Wire BrainstormButton into ManualResearchForm and ResearchAction
- Add blog_writer to gsc_auth router features for ALWRITY_ENABLED_FEATURES

backend/services/blog_writer/content/medium_blog_generator.py

@@ -269,16 +269,18 @@ class MediumBlogGenerator:
                     db=db,
                     user_id=user_id,
                     content=full_content,
-                    source_module="medium_blog_writer",
+                    source_module="blog_writer",
                     title=result.title,
-                    description=f"Generated medium blog: {result.title}",
-                    tags=req.researchKeywords or ["medium_blog", "ai_generated"],
+                    description=f"Blog: {result.title}",
+                    tags=req.researchKeywords or ["blog", "ai_generated"],
                     asset_metadata={
+                        "blog_type": "medium",
                         "model": result.model,
                         "generation_time_ms": result.generation_time_ms,
-                        "word_count": sum(s.wordCount for s in result.sections)
+                        "word_count": sum(s.wordCount for s in result.sections),
+                        "section_count": len(result.sections),
                     },
-                    subdirectory="medium_blogs"
+                    subdirectory="blogs"
                 )
                 logger.info(f"Saved medium blog content to user workspace for user {user_id}")
             except Exception as e: